It depends where it is leaking from, maybe if the leaks are round the top then a higher rise and tighter waist may help - but then if all the wee is pouring out of the nappy it would go through the wool anyway. Honestly if the nappy is that badly fitting then shorts may not help either.
It does sound like the huggles just aren't a good fit on her. I'd have a look at the night nappies board for other suggestions, or in ther for sale section, I know I'm selling a few
Or just stick with the bamboozles if they are working.